ECHO's Standard Operating Mode

Analog -

435.225 MHz FM Voice Downlink

145.920 MHz FM Voice Uplink + 67 Hz PL tone

+ simultaneous

Digital - 9600 bps, AX.25, PACSAT Protocol mailbox

435.150 MHz FM Downlink

145.860 MHz FM Uplink


Telemetry in the digital stream



Standard operations will occur each day except Wednesday.


ECHO Analog Voice Operation

Downlink: 435.225 MHz FM

Uplink: 145.920 MHz FM + 67 Hz tone (same tone as SO-50)

1-6 Watts out (programmable)

ECHO Digital Operation

Downlink: 435.150 MHz FM

Uplink : 145.860 MHz FM 9600 bps FM, AX.25

using the PACSAT Protocol Suite (like UO-22, KO-23/25)

Scheduled 1 Watt output

Store & Forward mailbox + telemetry

WiSP software manages the S&F mailbox

Telemetry in the data stream, WOD in file


Sample WiSP screen decoding UO-22

WiSP Screen Image

ECHO Broadcast callsign PACB-11

ECHO BBS callsign PACB-12


Preliminary ECHO Telemetry decoding screen from Mike Kingery

Echo Telemetry Screen Image

ECHO Experimenter's Day Operation

Wednesdays (UTC) 00:00 - 23:59

Default configuration will be:

1268.700 MHz uplink 9600 bps FM

2401.200 MHz downlink at 38.4 kbps FM

The ECHO Operations committee will determine modes and schedules for experiments.

Other experimental modes

FM voice Mode V/U, L/S and HF/U

Mode V/S, L/U, HF/S are also possible

Digital Store and Forward using 9.6 kbps, 38.4 kbps, 57.6 kbps or 76.8 kbps

PSK 31 Uplink on 10M SSB and downlink UHF FM

SQRX receiver retransmissions on UHF

Multi-band, multi-mode (10 MHz -1.3 GHz)

APRS transmissions - ground systems can receive 20 characters status messages

Experimental Torquer Rod

The torquer rod normally aligns the satellite with the earth's magnetic field. This experimental rod can alter its charge direction and strength, thus changing the satellite angle or even reversing it. Magnetorquer Rod and Control Board


ECHO Commissioning

Jim White reports that it make take anywhere between two weeks to two months. Once complete, the satellite will be opened to general use.

Commissioning will begin within hours of launch.

Launch window begins the end of June 2004.

Look forward to an exciting and versatile satellite in ECHO!

Much Thanks go to the ECHO Project Team (Rick Hambly, W2GPS, Dick Daniels, W4PUJ and Tom Clark, W3IWI), AMSAT BOD, SpaceQuest, and the many AMSAT volunteers including Jim White, Mike Kingery, Chuck Green, Lou McFadin, Stan Wood, Harold Price, Bob Diersing, Chuck Schultz, Harold Sanderson and Skip Hansen.

Look forward to an exciting new satellite!

Additional ECHO Information

AMSAT has a new book exclusively about ECHO.

54 pages full of information about ECHO's Operation, Development and Component Specifications

ECHO development

Launch site information

Launch vehicle information

Other satellites launching with ECHO

Basic satellite Commissioning process

Specifications on the various satellite components

Additional operational information

Experimental modes

Telemetry channels

Book Cover



AMSAT Journal


Mark Kanawati of SpaceQuest mounting a satellite similar to ECHO to the satellite platform

Echo in Final Inspection

(photo courtesy SpaceQuest)

Echo Operation Intro page